Assert class

Annotation util for performing build time asserts in the global namespace. This is useful for validating compile-time constants in a way that fails early, before runtime.

For example:

@Assert(
  myBuildTimeVal == 'val_a' || myBuildTimeVal == 'val_b',
  'myBuildTimeVal must be one of "val_a" or "val_b"',
)
const myBuildTimeVal = String.fromEnvironment('MY_VAL');

// Running this with '--define=MY_VAL=foo' will fail compilation.
void main() {
  print('myBuildTimeVal is $myBuildTimeVal');
}

Constructors

Assert(bool condition, String message)

Perform an Assert with a message.

const

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited